10. Making sexual jokes about her friends

Thinstock

There is always some element of truth behind a joke’s punch line. It's fine to joke with or about her friends, but when you make sexual jokes about them, it's going to set off the sirens in her head. It means you picture her friends in a sexual way, even if you're only making a joke. She doesn't want you making comments about her friends, thinking about her friends, looking at her friends, or even acknowledging her friends in any sexual capacity. Even if she asks you directly, it's a trap, with no correct answer. Don't talk about her friends in any other way than in friendly terms — unless they are bitches, but even then, let her say it first.